How to use the @cloudant/cloudant function in @cloudant/cloudant

// use IAM creds
    credentials.use_iam = true
    credentials.iam_apikey = process.env.CLOUDANT_IAM_APIKEY
    credentials.iam_username = process.env.CLOUDANT_IAM_USERNAME
    console.log("credentials.iam_apikey: " + credentials.iam_apikey)
    console.log("credentials.iam_username: " + credentials.iam_username)
  } else {
    credentials.username = process.env.CLOUDANT_USERNAME
    credentials.password = process.env.CLOUDANT_PASSWORD
    console.log("credentials.username: " + credentials.username)
    console.log("credentials.password: " + credentials.password)
  }

  if (credentials.use_iam) {
    // use IAM creds
    var cloudant = new Cloudant({
      account: credentials.iam_username,
      plugins: [
        'promises',
        {
          iamauth: {
            iamApiKey: credentials.iam_apikey
          }
        }
      ],
      plugin: 'promises'  // Using the promises plugin to allow use of async/await
    })
  } else {
    // use traditional uname/pwd
    cloudant = Cloudant({
      account: credentials.username,
      password: credentials.password,

// use IAM creds
    var cloudant = new Cloudant({
      account: credentials.iam_username,
      plugins: [
        'promises',
        {
          iamauth: {
            iamApiKey: credentials.iam_apikey
          }
        }
      ],
      plugin: 'promises'  // Using the promises plugin to allow use of async/await
    })
  } else {
    // use traditional uname/pwd
    cloudant = Cloudant({
      account: credentials.username,
      password: credentials.password,
      plugin: 'promises'  // Using the promises plugin to allow use of async/await
    })
  }

  return cloudant
}